Beyond Anglo-American Models: Japan’s Unique Approach to M&A and Its Impact on Shareholder Activism and Sustainability

This paper advances a new account of Japan’s takeover and shareholder-activism regime, arguing that it constitutes neither a derivative nor an incomplete version of U.S. or European models but a coherent “third path” with its own internal logic. Japan’s framework combines a corporate value standard with a strong principle of deference to shareholder intent. While boards are expected to evaluate bids by reference to long-term corporate value, defensive measures initiated without shareholder approval are typically enjoined by courts; conversely, shareholder-ratified poison pills are upheld. This equilibrium constrains managerial discretion and places ultimate decision-making authority in shareholders’ hands, even where shareholder preferences may diverge from managerial assessments of long-term value.

A distinctive feature of this system is its permissive stance toward partial tender offers in Japan. Drawing on a dataset of 196 partial bids from 2008 to 2024, the paper shows that target firms generally experience positive long-term stock performance and improvements in operating metrics such as ROE and ROA in the years following settlement. Contrary to conventional criticisms claiming that partial offers are harmful to minority shareholders, the empirical evidence suggests that such bids often enhance both corporate and shareholder value.

The paper concludes that Japan’s value-based yet shareholder-centric framework provides a coherent and normatively defensible alternative for jurisdictions seeking models beyond the dominant Anglo-American and European templates.